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Menus: on Windows, releasing Alt key now activates the menu bar (issue #43)

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This commit is contained in:
Karl Tauber
2020-05-04 10:57:10 +02:00
parent 80981f7027
commit f014e2473f
4 changed files with 96 additions and 4 deletions
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77
flatlaf-core/src/main/java/com/formdev/flatlaf/MnemonicHandler.java
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@@ -28,7 +28,10 @@ import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.lang.ref.WeakReference;
import javax.swing.AbstractButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JRootPane;
import javax.swing.JTabbedPane;
import javax.swing.MenuElement;
@@ -74,6 +77,9 @@ class MnemonicHandler
showMnemonics( shouldShowMnemonics( e ) && e.isControlDown() && e.isAltDown(), e.getComponent() );
} else {
// Alt key must be pressed on Windows and Linux
if( SystemInfo.IS_WINDOWS )
return processKeyEventOnWindows( e );
if( keyCode == KeyEvent.VK_ALT )
showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
}
@@ -86,10 +92,77 @@ class MnemonicHandler
MenuSelectionManager.defaultManager().getSelectedPath().length > 0;
}
private int altPressedEventCount;
private boolean selectMenuOnAltReleased;
/**
* Special Alt key behavior on Windows.
*
* Press-and-release Alt key selects first menu (if available) and moves focus
* temporary to menu bar. If menu bar has focus (some menu is selected),
* pressing Alt key unselects menu and moves focus back to permanent focus owner.
*/
private boolean processKeyEventOnWindows( KeyEvent e ) {
if( e.getKeyCode() != KeyEvent.VK_ALT ) {
selectMenuOnAltReleased = false;
return false;
}
if( e.getID() == KeyEvent.KEY_PRESSED ) {
altPressedEventCount++;
if( altPressedEventCount == 1 && !e.isConsumed() ) {
MenuSelectionManager menuSelectionManager = MenuSelectionManager.defaultManager();
selectMenuOnAltReleased = (menuSelectionManager.getSelectedPath().length == 0);
// if menu is selected when Alt key is pressed then clear menu selection
if( !selectMenuOnAltReleased )
menuSelectionManager.clearSelectedPath();
}
// show mnemonics
showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
// avoid that the system menu of the window gets focus
e.consume();
return true;
} else if( e.getID() == KeyEvent.KEY_RELEASED ) {
altPressedEventCount = 0;
boolean mnemonicsShown = false;
if( selectMenuOnAltReleased && !e.isConsumed() ) {
MenuSelectionManager menuSelectionManager = MenuSelectionManager.defaultManager();
if( menuSelectionManager.getSelectedPath().length == 0 ) {
// get menu bar and first menu
Component c = e.getComponent();
JRootPane rootPane = SwingUtilities.getRootPane( c );
Window window = (rootPane != null) ? SwingUtilities.getWindowAncestor( rootPane ) : null;
JMenuBar menuBar = (rootPane != null) ? rootPane.getJMenuBar() : null;
if( menuBar == null && window instanceof JFrame )
menuBar = ((JFrame)window).getJMenuBar();
JMenu firstMenu = (menuBar != null) ? menuBar.getMenu( 0 ) : null;
// select first menu and show mnemonics
if( firstMenu != null ) {
menuSelectionManager.setSelectedPath( new MenuElement[] { menuBar, firstMenu } );
showMnemonics( true, c );
mnemonicsShown = true;
}
}
}
// hide mnemonics
if( !mnemonicsShown )
showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
}
return false;
}
@Override
public void stateChanged( ChangeEvent e ) {
MenuElement[] selectedPath = MenuSelectionManager.defaultManager().getSelectedPath();
if( selectedPath.length == 0 ) {
if( selectedPath.length == 0 && altPressedEventCount == 0 ) {
// hide mnemonics when menu selection was canceled
showMnemonics( false, null );
}
@@ -126,7 +199,7 @@ class MnemonicHandler
// use invokeLater() to avoid that the listener is removed
// while the listener queue is iterated to fire this event
EventQueue.invokeLater( () -> {
showMnemonics( false, c );
showMnemonics( false, null );
} );
}
};